The Obamas' quest for a hypoallergenic dog looks doomed. According to a story in today's Vancouver Sun, there is no such thing.

"It is a common misconception that people are allergic to a dog's hair, and it is falsely believed that dogs that shed less will not cause a reaction," the American Academy of Allergy, Asthma and Immunology said.

"However, allergies to pets are caused by protein found in the animal's saliva and skin glands which gets deposited on the hair. These proteins are carried on microscopic particles through the air as an invisible aerosol. When inhaled, they trigger reactions in allergic people. As all dogs secrete these proteins, there is no allergy-free dog."

Will these tiny airborne truths dash our dreams of Tramp slurping spaghetti in the Oval kitchen?